I recently was struggling to configure encrypted /home on ZFS on Linux. A big pain point was determining the status of my datasets. I’d like to write a script zfs-list-long that in addition to the information provided by zfs list, would tell me for each dataset:
How would I get that information from a script?
You can get the mount status and keystatus with zfs get. zfs get all <filesystem> will list all of the properties as well.
Look at the man pages for zfs-list, zfs-get and zfsprops. They document scripting mode for each command along with which properties are available / what they are.
Both answers are generally right: zfsprops(7) will tell you about other things you can show.
Specifically what you asked for is something like:
$ zfs list -o name,used,avail,refer,mountpoint,mounted,keystatus
Examples:
On my local laptop (all encrypted datasets):
$ zfs list -o name,used,avail,refer,mountpoint,mounted,keystatus
NAME USED AVAIL REFER MOUNTPOINT MOUNTED KEYSTATUS
lucy 382G 1.37T 98K none no available
lucy/debian 29.2G 1.37T 17.9G / yes available
lucy/home 352G 1.37T 109K /home yes available
...
On my home NAS (a mix of unencrypted filesystems and laptop backups with no keys locally):
$ zfs list -o name,used,avail,refer,mountpoint,mounted,keystatus
NAME USED AVAIL REFER MOUNTPOINT MOUNTED KEYSTATUS
garden 36.3G 322G 96K /garden yes -
garden/ROOT 26.7G 322G 96K none no -
garden/ROOT/13.1-RELEASE-p6_2023-02-20_183106 8K 322G 5.52G / no -
garden/ROOT/13.1-RELEASE-p7_2023-04-11_175220 8K 322G 5.26G / no -
...
media/backup 471G 742G 36.5K none no -
media/backup/lucy 471G 742G 118K none no unavailable
media/backup/lucy/debian 47.3G 742G 18.1G none no unavailable
media/backup/lucy/home 421G 742G 120K none no unavailable
...
I’ve added this alias to my .bashrc:
alias zfslistfull=‘zfs list -o name,used,usedbydataset,usedbysnapshots,avail,refer,canmount,mounted,mountpoint’